Method of heating rivets.



No. 722,727. PATENTED MAR. 17,1903.

- H. v. LOSS.

METHOD OF HEATING RIVETS. APPLICATION nun Mn. 5, 1001.

NOMODEL.

. II I II j 6 k l l"-\ WITNESSESL 'INV NTQR wa /3w UNITED STATES PATENTOFFICE.

I-IENRIK V. LOSS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO WEST-INGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OFPENNSYLVANIA.

METHOD OF HEATING RIVETS.

SPECIFICATION forming part of Letters Patent No. 722,727, dated March17, 1903.

Application filed March 5, 1901. Serial No. 49,791. (No specimens.)

methods for heating rivets; and the object of my invention is to furnishan improved method for electrically heating rivets.

A rivet to be thoroughly effective should,

after it is upset as completely as possible, fill its grip-that is, thehole or holes in the plate or plates in which it is placedand in orderto accomplish this the point of the rivet should be heated to a lessdegree than the other parts, so that when pressure or blows are appliedto it that portion of it which is inclosed by the plates will be firstupset.

In carrying my method into practice I employ a device substantiallysimilar to that shown in the accompanying drawing, in which a is arivet, b a clamp adapted to en- 2 5 gage the shank of the rivet andwhich forms or is connected to one pole of the source g of electricenergy, and c a support or contact for holding the rivet at or near itshead, which forms or which is connected with the other 0 pole of thesource of electric energy. A current passes from clamp 6 through rivet ato support 0, or 'vice versa, heating to a very high degree that portionof the rivet which it traverses, but leaving all other points com- 3 5paratively cool. The relative position of the poles with the shank andhead of the rivet will determine the amount of unevenness in temperaturethroughout the length of the rivet. By the described method the rivets40 may be heated in the holes to be filled or previously to being placedtherein.

In an application of even date herewith and bearing Serial No. 49,792Ihave described and claimed an apparatus for electrically heating rivetsaccording to the method herein described and claimed.

Having thus described my invention, I claim- 1. The improvement in themethod of heating rivets which consists in passing an electric currentthrough the rivet from a point at a predetermined distance from itspoint or cylindrical end to a point at or beyond the junction of theshank and head.

2. The method of heating a metal rivet which consists in clamping theshank of the rivet at a predetermined distance from its cylindrical endto one terminal of an electric circuit and making engagement of therivet below the point of junction of its shank and head with the otherterminal of said circuit and passing an electric current through therivet between the said terminals.

3. The method of heating a metal rivet, which consists in making contactbetween its head and one terminal of an electric circuit and between apoint in the body of the rivet that is more or less remote from the endand the other terminal of said circuit and passing an electric currentthrough the circuit until the body of the rivet is heated to the desiredtemperature.

4. The method of heating a metal rivet, which consists in clamping therivet at apoint .between its ends to one terminal of an electric circuitand making engagement of the head of the rivet with the other terminalof such circuit and passing current through the circuit until the rivetis heated to the desired temperature.

HENRIK V. LOSS.

Witnesses:

CHARLES K. 'ZUY,"

C. PERCY MILLER.

